Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee811d12726dd5ee…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 21:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2464449cedf305336009d2004ef0f4f9 SHA-1: 459c817464b5ba396075237f5860b2c7decb6b75 SHA-256: ee811d12726dd5ee0dd39f696928803bab3523b33868b62412d20ee403686a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, flagged as a link farm, with a primary malicious URL identified. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though obfuscated, contains keywords related to interview questions, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=aws+interview+questions+and+answers
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fee4a615cbdb.pdf
    • https://static.s123-cdn-static.com/uploads/4392853/normal_600406941bf69.pdf
    • http://kinoogf.space/fitipubabuc3wr8.pdf
    • http://naturebiolog.space/what_does_newsmax_say_about_the_election_resultstu797.pdf
    • http://goods-amzon.com/sirupupoxidowolofpogs.pdf
    • http://indital.fun/baldor_algebra_wikipediaf20zx.pdf
    • http://fisuruwibowin.66ghz.com/biffar_anamma_formbar_frs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajixe/40889305993.pdf
    • https://s3.amazonaws.com/buponuwebi/messenger_lite_terbaru_2019.pdf
    • http://vibibedoxoxi.epizy.com/zifusesimikup.pdf
    • https://s3.amazonaws.com/jebokizez/keurig_k_mini_coffee_maker_bed_bath_and_beyond.pdf
    • https://s3.amazonaws.com/jenagubadopi/what_is_an_example_of_an_allusion_in_the_i_have_a_dream_speech.pdf
    • http://valamujunitun.epizy.com/27406871922.pdf
    • https://s3.amazonaws.com/gomaxod/otitis_externa_treatment_guidelines.pdf
    • https://s3.amazonaws.com/fokapikow/hydrochloric_acid_safety_data_sheet_australia.pdf
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_e86559e5dd83417394d5c14d5993497e.pdf?index=true
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_40ac978074cf483fb7b302c9d175b9ae.pdf?index=true
    • https://s3.amazonaws.com/zalomi/basanni_baa_song_pagalworld.pdf
    • https://s3.amazonaws.com/zarelusipofox/83025130529.pdf
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_1a4cc92cf8b94928af3f6f95d7c9aa45.pdf?index=true
    • http://lironif.epizy.com/zekapokawo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e94.bin
c39855d0685c9e5b390aefd7816576552673d783472e271bb263062a7bf4b6c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 5052 bytes
font_01_sfnt_off00011fe8.bin
cb215fa00c55deaac74f93632b50a348339b021c6b9924d0891cf6f8e34a1fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 11144 bytes

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